Convert MP4 to WebM Online Free

Transform your MP4 videos to WebM format directly in your browser. No upload needed — 100% private and free.

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Drag & drop your MP4 file here

or click to browse

Supports MP4 files

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Quality

How to Convert MP4 to WebM

Upload MP4

Drag & drop or click to select your MP4 video file.

Choose Quality

Select your preferred quality level for the output.

Convert & Download

Click convert and download your WebM file instantly.

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100% Private

Files never leave your device. All processing happens locally.

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Fast Conversion

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Web Optimized

WebM is the ideal format for web video delivery.

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Completely Free

No limits, no registration, no hidden costs.

Frequently Asked Questions

What is WebM format?

WebM is an open-source media format designed for the web. It provides high-quality video with smaller file sizes, making it ideal for websites and streaming.

Is my video uploaded to a server?

No. Your video is processed entirely in your browser using WebAssembly technology. No data is sent to any server.

What is the maximum file size?

Since processing happens in your browser, the limit depends on your device's available memory. We recommend files under 500MB for best results.

Why convert MP4 to WebM?

WebM offers better compression for web use, open-source royalty-free format, and native support in most modern browsers.